OBD-II code · Powertrain (generic, extended)
P24F6 Exhaust Aftertreatment Fuel Air Purge Valve Stuck Open
On systems that inject HC dosing fuel or AIR-assisted reductant into the aftertreatment, a purge valve clears the line after each dosing event. The ECM detects the valve stuck open — pressure or flow does not build up against a closed valve, so the dosing line cannot be charged. Common on diesel HC-doser hardware (DPF regen support).
Is it safe to drive with P24F6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyMechanically stuck open valve from soot or coking
- PossibleBroken return spring
- Less likelyCarbon or debris buildup preventing free movement
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.6–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Aftertreatment Purge Valve, Dosing Line
Related codes
- P24F3Reductant Tank Temperature/Fuel Temperature Correlation
- P24F4NOx Sensor Delayed Response - High to Low Bank 1 Sensor 1
- P24F5NOx Sensor Delayed Response - High to Low Bank 1 Sensor 2
- P24F7Exhaust Aftertreatment Fuel Air Purge Valve Stuck Closed
- P24F8Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit
- P24F9Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.